For those times when mechanically fixing a blown head gasket or cracked block would cost more than the vehicle is worth, or when your customer just can't afford the work, Bar's Leaks offers the professional DiFM HG-3 Head Gasket Repair Kit. The kit's patent-pending, three-step process is a complete head gasket set solution to permanently seal cracked cylinder heads, blown head gaskets, intake gasket leaks, all block leaks and other severe coolant leaks. It works on all gasoline and diesel engines, cast iron or aluminum blocks and heads, multi-layer steel gaskets, copper head gaskets and composite head gaskets.